diff --git a/test/_centos_7.Dockerfile b/test/_centos_7.Dockerfile
index 00543b67..434242bf 100644
--- a/test/_centos_7.Dockerfile
+++ b/test/_centos_7.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_centos_8.Dockerfile b/test/_centos_8.Dockerfile
index 7444551b..afd2dc8a 100644
--- a/test/_centos_8.Dockerfile
+++ b/test/_centos_8.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_debian_10.Dockerfile b/test/_debian_10.Dockerfile
index 9b72fc6a..54800d3c 100644
--- a/test/_debian_10.Dockerfile
+++ b/test/_debian_10.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_debian_9.Dockerfile b/test/_debian_9.Dockerfile
index d6609ba3..c590a657 100644
--- a/test/_debian_9.Dockerfile
+++ b/test/_debian_9.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_fedora_32.Dockerfile b/test/_fedora_32.Dockerfile
index 869efb2b..e9c2ff2a 100644
--- a/test/_fedora_32.Dockerfile
+++ b/test/_fedora_32.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_fedora_33.Dockerfile b/test/_fedora_33.Dockerfile
index 0a1ac59c..9ae94c70 100644
--- a/test/_fedora_33.Dockerfile
+++ b/test/_fedora_33.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_ubuntu_16.Dockerfile b/test/_ubuntu_16.Dockerfile
index a92bc6f6..e572efd1 100644
--- a/test/_ubuntu_16.Dockerfile
+++ b/test/_ubuntu_16.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
\ No newline at end of file
diff --git a/test/_ubuntu_18.Dockerfile b/test/_ubuntu_18.Dockerfile
index 2f63ea89..592c5c3f 100644
--- a/test/_ubuntu_18.Dockerfile
+++ b/test/_ubuntu_18.Dockerfile
@@ -12,5 +12,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \
diff --git a/test/_ubuntu_20.Dockerfile b/test/_ubuntu_20.Dockerfile
index caa6261f..80e2e007 100644
--- a/test/_ubuntu_20.Dockerfile
+++ b/test/_ubuntu_20.Dockerfile
@@ -13,5 +13,6 @@ RUN true && \
     chmod +x $SCRIPTDIR/*
 
 ENV PH_TEST true
+ENV OS_CHECK_DOMAIN_NAME dev-supportedos.pi-hole.net
 
 #sed '/# Start the installer/Q' /opt/pihole/basic-install.sh > /opt/pihole/stub_basic-install.sh && \